Now in terms of experience improvements - while this is time efficient when I make the payment in parallel to them making the coffee, I find paying to lightning address QR annoying. The main annoyance is that I need to put down the total amount in my app. Imo a better experience would be if the QR opens a page that either allows me to select from the list of products (e.g. Latte: 2000CRC, Espresso:1000CRC...), I just select those, tap pay and that opens my lightning wallet of choice. Even better would be if the website somehow magically knows exactly what I ordered (this would require coordination with some seller POS, so this more applies to restaurants, not ferias). The website could show something like

Rotten Pig Bitcoin Jungle - just some ideas 💡 😉